Self-opening die head



Patented Aug. 23, 1927.

UNITED STATES PATENT OFFICE.

ALBERT E. EREITENSTEIN, or NEW HAVEN, CONNECTICUT, ASSIGNCR. To THE GEO- METEIC Toon COMPANY, 0E NEW HAVEN, CONNECTICUT, A CORPORATION SIEl'aF-OPEN'ING'r DIE HEAD.

Application nied september 1e, 1926. 'serial No. 135,754.`

My invention relates to an improvement in self-opening die-heads of the class employing a tripping-sleeve axially movable upon an `axially-movable operating-sleeve1 by which latter the radially-movable chasers are forced inwardly into their cutting posii tions, the object being to pqiduce a durable,

' reliable, and ellicient die-,had constructed with particular reference to compact-ness as to its radius, so that a tripping-sleeve may` consists in a self-opening die-head characterized by having its body, its Chaser-operating sleeve, and its tripping-sleeve respectively reduced in diameter so as to provide each with two parallel bearing-surfaces of different diameters, whereby these three main elements of the die-head are nested tegether for the purpose of keeping thel ultimate diameter. of the die-head at the minimum diameter and for the additional purpose of providing bearings of such nature as to prevent the cramping of the parts when in operation.

My invention further consists in a selfopening die-head characterized as above and having certain other details of construction land combinations of parts as will be hereinafter pointed out in the claims.

In the accompanying drawings:

Fig. 1 is a view in side elevation of a selfopening die-head embodying` my invention;

Fig. 2 is a view thereof in front elevation;

Fig. 3 is a view thereof in transverse section on the line 3-3 of Fig. 1;

Fig. 4 is a broken longitudinal section on the line 4--4 of Fig. 2;

Fig. 5 is a broken detail sectional view on the line 5 5 of Fig. 2;

Fig. Gis a detached view, partly in side elevation and partly in longitudinal section,A of the operating-sleeve of the die-head; and

Fig. 7 is a corresponding view of the tripping-sleeve thereof.

In carrying out my invention, as herein shown, I employ a skeleton die-body 10 having an integral hollow shank 11 at its rear end. and formed at its forward end with four radial grooves l2 receiving a corresponding number of radially-movable chasers 13, each provided witha rearwardly-projecting pin 14 engagedby a spring-actuated plunger 15 located in a radial bore 16 directly back of the groove '12 in which the Chaser reciprocates` The inner ends of the said chasers are provided with the usual cutting-teeth, while their outer ends are beveled as at 17 for co-action with bevels 18 in the forward end of an operating-sleeve 19 having axial movement 11p-on the die-body 10, and formed at its rear end with an integral annular extension 20 of smaller external diameter than the external diameter of said forwardend. The interior wall of the said extension 2U lhas sliding bearing upon an internallythreaded adjusting-nut 21 mounted upon the externally-threaded portion of the die-body 10 and virtually forming a part thereof lin the functioning of the die-head. The said adjusting-nut is formed upon its inner periphery with an annular groove 22 receiving a locking-segment 23 normally urged outward into its locking position by helical springs 24 interposed between its respective ends and the ends of a filler-segment 25 located diametrically opposite it in the said groove 22 and hfeld against endwise displacement therein by being securedl by rivets 26 to a key 27 in the sleeve 19, whereby the locking-segment is maintained in correctposition with respect to the operating-sleeve 19. The springs 24 aforesaid normally urge the locking-segment 23 outward.- into an eccentric locking-groove 28 in the inner periphery of the extension 20 of the sleeve 19, so that the forward face of the segment engages with the forward wall 29 of the said groove 28, whereby the operating-sleeve 19 is held in its forward or Chaser-Closing position against the ,urge of two operatingsprings 30 interposed between the die-body 10 and the sleeve 19 and exerting a Constant effort to move the sleeve from front to rear, the forward ends'of the springs being extended into sockets 31 in the said die-body and their rear ends being extended into sockets 32 in the said extension of the sleeve.

For disengaging the locking-segment 23 from the shoulder 29, I Aemploy a transmission-member inthe form of a ball 33 located in a radial passage 34 in the extension 20. This ball engages with the outer face of the said segment and projects into a se ental notch 35 formed in the inner perip ery of an axially-movable trip in -sleeve 36, which, at its rear end, is re uce in internal diameter as at 37 to correspond to the external diameter of the extension 20 u on which it axially rides. The forward en of the said tripping-sleeve has'sliding bearing upon the operating-sleeve 19. The reduction in the diameter of the tripping-sleeve as at 37 produces a shoulder 38 between its ends normally resting against the shoulder 39 formed between the main body of the operatingsleeve 19 and extension 20 thereof. The notch 35 aforesaid is `formed with an inclined forward wall 40 co-acting with the ball 33 when the tripping-sleeve. is moved from front to rear with respect to the operating-sleeve, so as to crowd the ball radially inward and therefore move the segment 23 inward out of engagement with the shoulder 29 before mentioned. At its rear end the tripping-sleeve is formed with an external annular groove 41 receiving a yoke-or other suitable abutment installed in the ordinary manner in the machine in which the fixture is used. A

It will thus be seen, and particularly by reference to Fig. 4 of the drawings, that the rear ends of the operatingand trippingsleeves are nested together by the reduction of the rear end of the o erating-sleeve in external diameter and it ing the internal diameter of the rear end of the tripping sleeve to it, whereby the annular groove designed to receive the yoke or other stopabutment may be carried so far inward toward the axial center of the die-head that despite the employment of a tripping-sleeve to discharge the tripping function of the die-head, the distance from the axial center of the fixture to the external periphery of the tripping-sleeve need be no greater than the distance from the axial center of the fixture to the extreme tip of the tripping-member ordinarily mounted in the o eratingsleeve and project-ing therefrom, sucIh, for instance, as in United States Patent No. 1,563,108, dated November 24, 1925,- and United States Patent No. 1,579,912, dated April 6, 1926.

As shown, a stop-member 42, located in a slot 43 in the adjusting-nut 21, provides for normally checking the operating-sleeve vat the limit of its Chaser-retracted position. When it' is desired to remove the chasers from the fixture, the stop-member is manually pressed inward to permit the operatingsleeve to move rearward into its chaserclearance position, but as this forms no part of my present invention, it has not been illustrated in detail. g

It will beseen from the foregoing, that in a tripping-sleeve die-head constructed -in accordance with my invention, the radius of its swing is kept at the minimum by nesting its three main elements, that is to say, its body, its operating-sleeve, and its trippingsleeve, by reducing them in diameter back of their forward ends so that each is provided with two parallel .bearing-surfaces. In the construction shown, one of the bearings for the operating-sleeve -is provided by the adjusting-nut, which, as before pointed.

out, virtually forms a part of the body, since itis moved with respect to the die-bo y only very slightly and then only occasionally to adjust the cutting diameter of the dies.

I claim:

1. A self-opening die-head having a bod reduced in diameter back of its forward en radially-movable chasers installed in the forward end of the said body, an axially-movable chaser-o erating sleeve embracing said body and re uced in external and internal diameter 'back of its forward end and having bearing upon the forward end of the said body and also upon the reduced rear portion thereof, a releasable locking-member for holding the said sleeve in its Chaser-closing position, and a cup-'shaped tripping-sleeve embracing said operating-sleeve and havinv axial movement upon the said oper-v atlng-sleeve for operating the said locking-member to release the same, and reduced in internal diameter back of its forward end and bearing upon the forward end of the said operating-sleeve and also upon the reduced rear portion thereof, whereby the said body and the said sleeves are nested for reducing the ultimate diameter of the fixture, the external diameter of the rear portion of said tripping-sleeve being substantially no greater than the forward portion thereof.

2. A self-opening diehead having a body reduced in diameter back of its forward end,

radially-movable chasers installed in theV forward end of the said body, an adjustingnut mounted upon the reduced rear portion of the body, van axially-movable chaser-operating sleeve embracing said body and reduced in externaland-internal diameter back of its forward end and having bearing upon the forward end of the said body and also upon t-he said adjusting-nut, a releasa-ble locking-member for holding the said sleeve in its chaser-closing position, and a cup-shaped tripping-sleeve embracing said operatingsleeve and having axial movement upon the said operating-sleeve for operating the saidv locking-member to release the same, and reduced in mternal diameter back of its forward end and bearing upon the forward end lll) duced rear portion thereof, whereby the said ture, the external diameter of the rear portion of said tripping-sleeve being substantially no greater than the forward portion thereof.

3. A self-opening die-head having a body reduced in diameter back of its forward en vradially-movable chasers installed in the forward end of the sa'idvbody,`an axiallymovable @baser-operating sleeve embracing said body and reduced in external and-internal diameter back of its forward end and said body and also upon the reduced p0rtion thereof, a releasable locking-member for holding the said sleeve in its chaserclosing position, and a cup-shaped trippingsleeve embracing said operating-sleeve an having axial movement upon the said o erating-sleeve for operating the said locking- Amem er to release the same, and reduced in internal diameter back of its forward end and bearing upon the forward end of the operating-sleeve and also upon the reduced rear portion thereof and provided with an external annular groove in line with its reduced portion, whereby the said body and the said said sleeves are nested for reducing the ultimate diameter of the fixture, the external diameter of the rear portion of said tripping-sleeve being substantially no real'.- er than the forward portion thereo 4. A self-opening die-head having a bod reduced in diameter back of its forward en radially-movable chasers installed in the forward end of the said body, an axially-movable Chaser-operating sleeve embracing said body and reduced in external and internal diameter back of'its forward end and having bearing uponthe forward end of the body and also upon the reduced rear portion thereof, a releasable locking-member for holding the said sleeve in its Chaser-closing position, and a ciip-shaped tripping-sleeve yembracing said operating-sleeve and having axial movement upon the s-aid operatingsleeve for operating the said locking-member to release the same, and reduced in internal diameter back of its forward end and bearing upon the forward end of the operating-sleeve and also upon the reduced rear portion thereof and providedy with an exter-v nal annular groove and an internal slot, both in line with its reduced portion, and the said slot having its forward wall beveled.I whereby the said body and the said sleeves are nested for reducing the ultimate diameter of the fixture, Vthe external diameter of the rear portion of said tripping-sleeve being substantially no greater than the forward portion thereof.

. l 5. A self-o ening die-head having a body reduced in iameter back of its forward end, radially-movable chasers installed in the forward end of the said body, an adj usting-nut mounted upon the reduced rear portion of the said body and provided with an annular external groove, an axially-movable chaser-operating sleeve embracing said body andrrediiced in external and internal diameter back of its vforward end and having bearing upon the forward end of the said body and also upon the said adjusting-nut and formed with a radial passage, an axially-movable cup-shaped tripping-sleeve embracing saidbody and reduced in internal diameter back of its forward end and bearsleeve and also upon the reduced` rear portioncthereof and provided 4with an external annular groove and with'an internal slot having its forward Wall beveled, the said f having bearing upon the forward'end of the \\ing upon the forward end of the operatingv groove and slot being in line with its re- L duced rear portion, a releasable lockingmember located in the said roove of the adjusting-nut, and a transnntting-member vto provide two parallel external bearingsurfares of different diameters; radiallymovable chasers installed in the forward end of the said body; an axially-movable `Chaser-operating sleeve embracing said body and having Chaser-closing and Chaser-retractedpositions, the said sleeve being reduced in internal diameter back of its forward end toprovide two parallel internal bearing-surfaces of different diameters; a releasable locking-member for holding the said sleeve in its Chaser-closing position; and an axially-movable cup-shaped tripping-sleeve embracing said operating-sleeve and reduced in internal diameter back of its forward-end to provide two parallel internal bearing-surfaces said reduced portions of the body, operating-sleeve, and tripping-sleeve being nested together and prevented from cramping, the external diameter of the rear portion of said tripping-sleeve being substantially no greater than the forward portion thereof.

7. A self-opening die-head having a body reduced in diameter back of its forward end to provide two parallel external bearingsurfaces of different diameters; radiallymovable chasers installed in the forward end positions, the said sleeve being reduced in external diameter back of its forward end of vdifferent diameters;

' and reduced in internal diameter back of its forward end to provide two parallel internal bearing-surfaces of different diameters for bearing respectively upon the said arallel bearing-surfaces of the body; a re easable locking-member for holdin the Saad sleeve in its chaser-retracted posltion; and

an axially-movable cup-shaped trippingsleeve embracing said operatingsleeve and reduced in internal diameter back of its forward end to provide two internal bearing'- surfaces of different diameters; said reduced portions of the body, operatlng-sleeve, and tripping-sleeve being nested together and prevented from cramping, the external diameter of the rear portion of said tripping-sleeve being substantially no greater than the forward portion thereof.

8. A self-opening die-head having a body reduced in diameter back of its forward end to provide two parallel external bearing-surfaces of different diameters; radially-movable chasers installed in the forward end of the said body; an axially-movable chaseroperating sleeve embracing said body and having Chaser-closing and Chaser-retracted positions, the said sleeve being reduced in external diameter bacliof its forward end, and reduced in internal diameter back of its forward end to provide two 'parallel internal bearing-surfaces of different diameters;

f a releasable locking-member for holding the said sleeve in its Chaser-closing position; a cup-shaped tripping-sleeve embracingA said operating-sleeve and having axial movement upon the said operating-sleeve for o erating the said locking-member to release t e same and reduced in internal diameter back of its forward end to provide two parallel internal bearing-surfaces of different diameters; said reduced portions of the body, operating-sleeve, and tripping-sleeve being nested together and prevented from cramping, the external diameter of the rear portion of said tripping-sleeve being substantlally no greater than the forward portion thereof. V

9. A self-opening die-head having a body reduced in external diameter back of its forward end to provide two parallel bearingsurfaces of different diameters; radiallymovable chasers installed in the forward end ofy the said body; spring means normally tending to urge the said chasers radially outward; an axially-movable Chaser-operatingv sleeve embracing said body for moving the said -chasers radially inward and having Chaser-closing and Chaser-retracted posit-ions, the said sleeve being reduced in internal diameter back of its forward'end to provide two parallel internal bearing-surfaces of different diameters; a releasable locking-member for holding the said sleeve in .its chaserclosing position; means tending to move the sleeve into its chaser-retracted position; and an axially-movable cup-shaped trippingsleeve embracing said operating sleeve and reduced in internal diameter back of its forward end tofprovide two parallel internal bearin -surfaoes of different diameters; said reduce portion of the body, operatingsleeve, and tripping-sleeve being nested together, the external diameter lof the'lrear portion of said tripping-sleevebeing substantially no greater than the forward portion thereof. l

1U. A self-opening die-head having a body reduced in diameter back of its forward end to` rovide two parallel external bearingsur aces of different diameters; radiallybearing respectively upon the said parallel v bearing-surfaces of the body; a releasable locking-member for holding the said sleeve in its Chaser-retracted position; means tending to move the sleeve into its chaser-,retracted position; and an axially-movable cupshaped tripping-sleeve, embracing said -operating sleeve and reduced in internal diameter back of its forward end to provide two internal bearing-surfaces of different diameters; said reduced portions of the body, op-

erating-sleeve, and tripping-sleeve being nested together and prevented from cramping, the external diameter of the rear portion of said tripping-sleeve being substantially no greater than the forward portion thereof.

11. A self-opening die-head having a body reduced in diameter back of its forward end to provide two parallel external bearing-surfaces of different diameters; radially-movable chasers installed in the forward end of the said body; spring means normally tending to urge the said chasers radially outward; an axially-movable chaser-operating sleeveembracing said body for moving the said chasers radially. inward and having Chaser-closing and Chaser-retracted positions, the said sleeve being reduced in external diameter back of its forward end, and reduced in internal diameter back of its forward end to provide two parallel internal bearing-surfaces of different diameters; means tendin to move the sleeve into its chaser-retracte position; a releasable locking-member for holding the said sleeve in its chaser-closing posit-ion; a cup-shaped tripping-sleeve embracing vsaid operating-sleeve and having axial movement upon the said operatingsleeve for operating the said locking-member from cramping, the external diameter of the to release the same and reduced in internal rear portion of said tripping-sleeve being diameter back of its forward end to provide substantially no greater than the forward 10 two parallel internal bearing-surfaces of difportion thereof.

5 ferent diameters; said reduced portions of In testimony whereof, I have signed this the body, operating sleeve, and trippingspecification. sleeve are nested together and prevented ALBERT F. BREITENSTEIN. 

